Q: My mechanic said I needed an alternator. He fixed the starter now My car is making this loud knocking noise, what could it be?

asked by on

There is a loud knocking noise on the driver's side under the hood when the car is turned on and when the gas pedal is pushed upon acceleration.

My car has 230000 miles.
My car has an automatic transmission.

Hi there. I believe we answered your question earlier, but if the mechanic is telling you that you need an alternator, it’s possible the noise and the power issue is related. The alternator, like many other accessory systems is powered by a serpentine belt. The belt is driven by a series of pulley’s. and when they wear out, a ticking noise is one of the most common symptoms. Again, without being there to complete an inspection, any repair suggestions would be guesses on our part and not very responsible on our behalf. I really believe it is best for you to seek a second opinion by having one of our mobile mechanics complete the car is making a noise inspection. You can click this link to set up the service if you’d like.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My mechanic said I needed an alternator. He fixed the starter now My car is making this loud knocking noise, what could it be?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My Check Engine Light is on and the machine said I have an exhaust leak

She is correct. There is a lot of pressure coming from your engine; in fact, it's actually fire when the exhaust comes out at the beginning. You will need to have the exhaust manifold replaced because it's not good for...

Q: Do I need new gaskets when replacing the Y-pipe back?

Hi. Yes you should put in new gaskets for your exhaust system. If you do not replace the gaskets there is the potential that the old gasket will leak and cause exhaust noise. When replacing anything that has a gasket...

Q: My negative battery cable start smoking when the car is running.

There is a faulty, high resistance (often due to corrosion, wire defect or break or loose mechanical connection) connection at the battery post and/or at the vehicle ground(s) at the frame. The recommended and safest practice is to replace the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.